The effect of uniaxial pressure on the superconducting transition temperature, T-c, was studied in organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2). When the pressure was applied along the c-axis in the conducting b - c plane, partial derivativeT/partial derivativep was found to show a positive value. In other words, T-c increased by application of pressure, in contrast to other cases including the uniaxial pressure perpendicular to the conducting plane and the hydrostatic pressure. Detailed experimental studies on the temperature dependence of magnetization under uniaxial pressure using SQUID magnetometer are presented.